I have one criticism of my Melnor 4100 lawn sprinkler: there is no indication on the sprinkler telling you which way to move the slides to open or close the end holes. Just by looking at it while it is not running you don't know if the holes are open or closed. I took a metallic silver Sharpie and wrote "OPEN" and "CLOSED" on opposite sides of the sprinkler so I will be able to tell in the future without needing to first turn it on.